Good A is a luxury and Good B is a necessity. Good C competes with many substitute products while Good D has few substitutes. You would expect the demands for goods:

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Luxury goods like Good A typically have price elastic demand because consumers can easily forego them when prices rise. Goods with many substitutes, like Good C, also tend to have elastic demand because consumers can switch to alternatives if the price increases. Necessities like Good B and goods with few substitutes, like Good D, usually have inelastic demand because consumers continue to buy them even when prices increase, due to the lack of alternatives or essential nature of the product.

Good a Is a Luxury and Good B Is a Necessity